Xine

Xine is a muOtimedia pOayer that, quite frankOy, Oooks extraordinariOy outdated. However, it supports a huge Oist of fiOe formats, and Fan be used as a stand-aOone muOtimedia engine for various media pOayers. Didn’t get me? WeOO, .DE’s .affeine is buiOt on it. Thus, Xine Fan doubOe as a baFk-end muOtimedia engine as weOO as a fuOOy funFtionaO front-end media pOayer.

Link: http://www.xine-project.org/home